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|Title:||Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at s√=13 TeV with the ATLAS detector|
|Other Titles:||Search for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at s root=13 TeV with the ATLAS detector|
Abed Abud, A.
Abusleme Hoffman, A.C.
Adam Bourdarios, C.
|Citation:||European Physical Journal C: Particles and Fields, 2022; 82(4):334-1-334-35|
|Publisher:||Springer Science and Business Media LLC|
|The Atlas Collaboration ... G. Aad ... Paul D. Jackson ... Albert X. Kong ... Harish Potti ... Tristan A. Ruggeri ... Martin White ... et al.|
|Abstract:||A search is presented for the production of a single top quark via left-handed flavour-changing neutral-current (FCNC) interactions of a top quark, a gluon and an up or charm quark. Two production processes are considered: u+g→t and c+g→t. The analysis is based on proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. The data set corresponds to an integrated luminosity of 139 fb−1. Events with exactly one electron or muon, exactly one b-tagged jet and missing transverse momentum are selected, resembling the decay products of a singly produced top quark. Neural networks based on kinematic variables differentiate between events from the two signal processes and events from background processes. The measured data are consistent with the background-only hypothesis, and limits are set on the production cross-sections of the signal processes: σ(u+g→t)×B(t→Wb)×B(W→ℓν)<3.0pb and σ(c+g→t)×B(t→Wb)×B(W→ℓν)<4.7pb at the 95% confidence level, with B(W→ℓν)=0.325 being the sum of branching ratios of all three leptonic decay modes of the W boson. Based on the framework of an effective field theory, the cross-section limits are translated into limits on the strengths of the tug and tcg couplings occurring in the theory: |CutuG|/Λ2<0.057TeV−2 and |CctuG|/Λ2<0.14TeV−2. These bounds correspond to limits on the branching ratios of FCNC-induced top-quark decays: B(t→u+g)<0.61×10−4 and B(t→c+g)<3.7×10−4.|
|Rights:||© The Authors 2022 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecomm ons.org/licenses/by/4.0/.|
|Appears in Collections:||Physics publications|
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